Residual stresses and strength of multilayer tape cast solid oxide fuel and electrolysis half-cells

摘要: Abstract The cost-effectiveness of Solid Oxide Cells production can be improved by introducing “multilayer-tape-casting” (MTC: sequential casting the layers) and co-sintering half-cells. MTC additionally results in more homogeneous layers with strong interfaces. However, thermal expansion coefficient (TEC) mismatch between layers, cumulated from high temperature, induces significant residual stresses Furthermore, it has been observed that half-cells 4 (MTC4: support, fuel electrode, electrolyte barrier layer) are sometimes fragile to handle than those 3 (MTC3: without layer). bending strength MTC3 MTC4 under various loading orientations (electrolyte on tensile or compressive side loading) is compared. analysis, taking into account, shows corresponds support. With other direction side), origin failure a different layer for (fuel electrode) (barrier In order decrease stresses, especially outer barrier-layer, possible changes properties discussed some optimization guidelines proposed.